丝状菌颗粒污泥形成过程及其对膨胀控制的启示

Formation of Filamentous Granular Sludge and Bulking Control

通过试验和观察,从粒径、密度、沉速、基质交换和孔隙率等方面对比分析了丝状菌颗粒污泥与普通好氧颗粒污泥、黑色颗粒污泥的异同,同时研究了丝状菌颗粒污泥的形成过程及丝状菌的缠绕特性与演替规律。研究表明丝状菌对于聚集体的形态有一定的选择性,而且易于被改造的丝状菌结构与丝状菌的类型也有一定的关系;另外,剪切力及丝状菌网眼的尺寸在丝状菌污泥颗粒化过程中亦具有重要意义。最后论证了通过颗粒化技术改变丝状菌发散式生长模式使其自我缠绕致密生长的可行性,为丝状菌污泥膨胀控制提供了一种新思路。

The similarities and differences of filamentous granular sludge, general aerobic granular sludge and black granular sludge were analyzed in terms of particle size, density, settling velocity, matrix switching, and porosity. The formation process of filamentous granular sludge as well as the coverage characteristics and the succession law of filamentous bacteria were investigated. The results showed that filamentous bacteria exhibited some selectivity for the forms of aggregates, and the structure of the filamentous bacteria, which was easy to reconstruct, also had a certain relationship with the filamentous bacteria＇ s type. Additionally, shear force and mesh size of filamentous bacteria played an important role in the process of granulation. The feasibility of changing the divergent type growth mode of filamentous bacteria through the granulation technology, by means of improving sludge structure, was demonstrated to provide a new approach for filamentous bulking control.